The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 1985
Filed:
Aug. 20, 1984
Applicant:
Inventor:
Norvell J Nelson, Palo Alto, CA (US);
Assignee:
Psi Star, Hayward, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; B44C / ; C03C / ;
U.S. Cl.
CPC ...
156642 ; 156666 ; 252 792 ;
Abstract
Process and solution for etching copper and other metals, wherein the etching solution is regenerated and the copper or other metal is recovered in a relatively pure and useful form. The metal is contacted with an aqueous solution of nitric acid to dissolve the metal and form a nitrate of the metal, and sulfuric acid is added to the solution to convert the nitrate to nitric acid and a precipitate of the metal.